Specifications

iMac (Early 2006 17-inch) Troubleshooting — Symptom Charts 141
Yes: Replace the original SDRAM and test again. If the front LED does not go o with the only
the original SDRAM installed, replace the SDRAM. If the LED is now reliably going o after a
few moments, but yet you still do not have any video, go to step 8.
No: If the LED remained on, the main logic board is not communicating with the LCD panel
to generate video. Replace the main logic board.
7. With the LED going o, you may have a No Backlight condition or an LCD failure. In a dim room,
turn the display at an angle to you and look closely at the display. Is the display completely black
or can you see a dim, purplish light or glow to the display?
Completely black: Replace the inverter
Dim purplish light or glow: Replace the LCD panel.
Display is tinted another color.
Reset the parameter RAM. Press the Command-Option-P-R keys. When you keep all the keys
held down, you will hear the startup chime over and over again (about every ten seconds)
until you let go. After you hear the second chime, you can let go of the keys.
Does the computer display video after successfully resetting the computer’s PRAM?
Yes: Problem resolved. Restart the computer from the Apple menu and make sure the
computer display is no longer tinted another color.
No: Continue to the next step.
Connect an external monitor to the mini-VGA port. Does the external display exhibit the
same color tinting?
Yes: Replace the logic board.
No: Check the TMDS cable connection. If connected and same color tinting persists, replace
the TMDS cable. Does color tinting persist after changing the TMDS cable?
Yes: Replace the LCD display panel.
No: Problem solved. Restart the computer from the Apple menu and make sure the
computer display is no longer tinted another color.
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